Spring @Scheduled定时任务的fixedRate,fixedDelay,cron执行差异

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import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class MyProcessor{

DateFormat sdf = new SimpleDateFormat("HH:mm:ss");

int[] delays = new int[]{8,3,6,2,2};
int index = 0;

@Scheduled(cron = "0/5 * * * * ?}")
public void process() {
try {
if(index > delays.length - 1){
if(index == delays.length){
System.out.println("---------- test end at " + sdf.format(new Date()) + " ---------");
}
index ++;
return;
}else{
System.out.println(index + ":start run at" + sdf.format(new Date()));
}
Thread.sleep(delays[index] * 1000);
System.out.println(index + ":end run at " + sdf.format(new Date()));
index ++;
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}